<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script>
			var reg = /a[abc]c/;
			var str = 'aac';
			var re = reg.test(str);
			console.log(re);
			
//			\d<=>[1234567890] <=>[0-9]
//			\D<=>[^0-9]
//			\w<=>[a-zA-Z_]

			
		</script>
	</head>
	<body>
	</body>
</html>
